SU1406696A1 - Sine-cosine rotary transformer - Google Patents

Abstract

This invention relates to information technologies, electrical AC micromachines used in computing and automatic devices. The aim of the invention is to improve the accuracy of the operation of rotating transformers (BT) with loop two-phase two-layer distributed windings with shortened pitch. This is achieved by an appropriate distribution and selection of the shortening factors for the pitch of the primary and secondary windings W. For this, the excitation winding (O) is placed on 2/3 of the groove area of the external magnetic core, and the square square O is placed in the slots of the same magnetic core partially occupied by the excitation winding. Such a redistribution of the areas of the grooves under the primary O, i.e. ensuring the distribution coefficient for the third and the shortening coefficient for the fifth harmonic are equal to zero, perm. 1, exclude from the composition of the excitation, and consequently, from the composition of the output emf, not one, but two higher harmonic components. Output O are also made with step shortening, which additionally eliminates another harmonic from the output emf. As a result, the three most significant harmonic components (as well as their harmonic harmonics) are excluded from the output emf, and the percentage of the remaining harmonics is reduced. However, the general content | the harmonic components in the output signals of the BT are significantly reduced. 2 ik (L

Description

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The invention relates to information electrical micromachines, and more specifically to rotary transformers used in automatic and computing devices.

The aim of the invention is to improve the accuracy of operation of bipolar rotary transformers with two-layer distributed windings with shorter pitch.

FIG. Figure 1 shows schematically the design of a rotating transformer; in fig. 2 is a scan of the stator magnetic circuit with an excitation winding and its MDS diagram.

The transformer contains toothed laminated packages of external 1 and internal 2 magnetic cores. Excitation winding 33 and quadrature winding 34 are laid in the grooves 3-32 of the external magnetic core. Output windings 35 and 36 are placed in the grooves of the internal magnetic core. The number of grooves of the external magnetic circuit is chosen to be thirty, and the internal one - twenty eight. All windings are double-layered with shortening of the schag, and the field winding is shortened by 1/5. In addition, the area of the slots occupied by the excitation winding 33 is 2/3 of the total area of the slots occupied by the excitation winding 33 is 2/3 of the entire area of the slots of the Bneinne magnetic core 1. With this arrangement, the number of slots per pole and phase for

  2 Z ,,.

this tomotki tr

The quadrant obmotka 34 is laid in the grooves, partially occupied by the excitation winding (grooves 4-6, 14-16, 19-21, 29-31). The slots 3, 17, 18, 32, in which there are no field winding conductors, remain unfilled.

The output windings 35 and 36, located in quadrature with each other, occupy half the area of the grooves of the internal magnetic circuit and are made with the usual two-layer with shortened step and with a whole number of grooves per pole and phase q.

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The principle of formation of such windings is shown schematically (Fig. 1).

The transformer works as follows.

When an alternating current voltage is applied to the excitation winding 33, a current flows through it and a pulsating magnetic field is excited, distributed in the air gap according to a stepwise law (Fig. 2). The resulting flow, coupled with the secondary windings 35 and 36, leads to them EMF

with an amplitude in one of them, for example, 35, proportional to the sine of the angle of rotation of the rotor, and in the other (36) - the cosine of that angle. The compensation winding 34 dampens the cross-flow of the reaction when the secondary windings are loaded. Due to the placement of the winding 33 of the excitation on 2/3 of the area of the grooves of the external magnetic circuit, its distribution coefficient for the 3rd harmonic is zero. Consequently, this harmonic magnetic field and multiples of it in the air gap are absent. The distribution coefficient for the third harmonic.

four.,

Cr,

sin (3-q.) qcsin (3.)

sin {3-10-6 °) 10 sin (3 6 °)

 0,

where dr

2l

Zc

12 ° - angular step grooves

external magnetic circuit;

0

  m

Omf

The number of grooves on the pole and phase of the excitation winding.

B. Shgodar shortening the excitation winding to 1/5 pole division in the air gap is absent and multiples of its harmonics of the magnetic field.

The device is easy to perform. Packets of magnetic cores, as usual, are made from permallo forged plates. The grooves of the magnetic circuits are made with a bevel in the overall complexity of one) 1O dentate division. The windings are wound in two layers with the laying of opposite conductors of the section into different layers, in which case the compensation winding is laid with the passage of 2 slots on each side of the external magnetic conductor, which eliminates harmonics that are multiples of meters, and improves the accuracy of Q reproduction sinus dependence.

Claims (1)

Invention Formula A sine-cosine vrapiping transformer containing external and internal magnetic cores with double-layer shortened excitation winding, quadrature winding and output windings, the excitation winding occupying 2/3 of the stator groove area and shortened by 1/5 of a diagonal schag, in that In order to improve accuracy, the square winding is located in slots in which the field winding is laid in one layer. 3 50 L /, / 7 2 23 25 2 qoae.i